A condition developed from a lack of rest. Symptoms include droopy eyes, yawning, and the desire to lie down. Can be treated with the ingestion of caffeine. Side effects include increased urine production and hyperactivity.

The Urban Dictionary Mug

a matress store that has one day sales every day from 10am-9pm on any occasion.

Steve: Hey Bob! are you going to sleepy's one day sale? its a once in a lifetime event!
Bob: No Steve I was planning on going tomorrow because they have another one day sale! In fact i think this is the 7th one day sale this week!